1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ART_RUNTIME_INDENTER_H_
18#define ART_RUNTIME_INDENTER_H_
19
20#include "base/macros.h"
21#include <streambuf>
22
23const char kIndentChar =' ';
24const size_t kIndentBy1Count = 2;
25
26class Indenter : public std::streambuf {
27 public:
28  Indenter(std::streambuf* out, char text, size_t count)
29      : indent_next_(true), out_sbuf_(out), text_(text), count_(count) {}
30
31 private:
32  int_type overflow(int_type c) {
33    if (c != std::char_traits<char>::eof()) {
34      if (indent_next_) {
35        for (size_t i = 0; i < count_; ++i) {
36          out_sbuf_->sputc(text_);
37        }
38      }
39      out_sbuf_->sputc(c);
40      indent_next_ = (c == '\n');
41    }
42    return std::char_traits<char>::not_eof(c);
43  }
44
45  int sync() {
46    return out_sbuf_->pubsync();
47  }
48
49  bool indent_next_;
50
51  // Buffer to write output to.
52  std::streambuf* const out_sbuf_;
53
54  // Text output as indent.
55  const char text_;
56
57  // Number of times text is output.
58  const size_t count_;
59
60  DISALLOW_COPY_AND_ASSIGN(Indenter);
61};
62
63#endif  // ART_RUNTIME_INDENTER_H_
64